Re: [PATCH net-next v5 5/9] virtio-net: support receive timestamp

[sashiko-bot@kernel.org]

> Add optional hardware rx timestamp offload for virtio-net.
> 
> Introduce the virtio feature VIRTIO_NET_F_RX_TSTAMP. If negotiated, the
> virtio-net header grows by room for a 64 bit TAI timestamp (header
> size 40 bytes), stored in struct virtio_net_common_hdr. The layout is
> cumulative: the field is at the same offset whether or not the
> features before it were negotiated. The fixed layout needs
> VIRTIO_F_VERSION_1, so the feature is cleared without it.
> 
> Implement ndo_hwtstamp_get/set so the timestamping can be enabled
> and disabled at runtime with SIOCSHWTSTAMP. The driver cannot filter
> what the device timestamps, so any rx filter other than NONE becomes
> ALL. The timestamp is read before the packet is handed to the XDP
> program or the stack, and attached to the skb with skb_hwtstamps().
> It is a raw TAI value; there is no PHC.
> [ ... ]
>   host:  nc -4 -u 192.168.1.1 319
> 
> Based on work by Willem de Bruijn.
> 
> Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>

Sashiko has reviewed this patch and found no issues.

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Sashiko AI review · https://sashiko.dev/#/patchset/20261112-v6-7-topic-virtio-net-ptp-v5-0-7ab67b572f4f@pengutronix.de?part=5